1 /* 2 * X.25 Packet Layer release 002 3 * 4 * This is ALPHA test software. This code may break your machine, 5 * randomly fail to work with new releases, misbehave and/or generally 6 * screw up. It might even work. 7 * 8 * This code REQUIRES 2.1.15 or higher 9 * 10 * This module: 11 * This module is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 * 16 * History 17 * X.25 001 Jonathan Naylor Started coding. 18 * X.25 002 Jonathan Naylor Centralised disconnect handling. 19 * New timer architecture. 20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. 21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of 22 * facilities negotiation and increased 23 * the throughput upper limit. 24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups 25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept(). 26 * Fixed x25_output() related skb leakage. 27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. 28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. 29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN 30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to 31 * x25_proc.c, using seq_file 32 * 2005-04-02 Shaun Pereira Selective sub address matching 33 * with call user data 34 * 2005-04-15 Shaun Pereira Fast select with no restriction on 35 * response 36 */ 37 38 #define pr_fmt(fmt) "X25: " fmt 39 40 #include <linux/module.h> 41 #include <linux/capability.h> 42 #include <linux/errno.h> 43 #include <linux/kernel.h> 44 #include <linux/sched/signal.h> 45 #include <linux/timer.h> 46 #include <linux/string.h> 47 #include <linux/net.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_arp.h> 50 #include <linux/skbuff.h> 51 #include <linux/slab.h> 52 #include <net/sock.h> 53 #include <net/tcp_states.h> 54 #include <linux/uaccess.h> 55 #include <linux/fcntl.h> 56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 57 #include <linux/notifier.h> 58 #include <linux/init.h> 59 #include <linux/compat.h> 60 #include <linux/ctype.h> 61 62 #include <net/x25.h> 63 #include <net/compat.h> 64 65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 66 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 67 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 68 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 69 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 70 int sysctl_x25_forward = 0; 71 72 HLIST_HEAD(x25_list); 73 DEFINE_RWLOCK(x25_list_lock); 74 75 static const struct proto_ops x25_proto_ops; 76 77 static const struct x25_address null_x25_address = {" "}; 78 79 #ifdef CONFIG_COMPAT 80 struct compat_x25_subscrip_struct { 81 char device[200-sizeof(compat_ulong_t)]; 82 compat_ulong_t global_facil_mask; 83 compat_uint_t extended; 84 }; 85 #endif 86 87 88 int x25_parse_address_block(struct sk_buff *skb, 89 struct x25_address *called_addr, 90 struct x25_address *calling_addr) 91 { 92 unsigned char len; 93 int needed; 94 int rc; 95 96 if (!pskb_may_pull(skb, 1)) { 97 /* packet has no address block */ 98 rc = 0; 99 goto empty; 100 } 101 102 len = *skb->data; 103 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2; 104 105 if (!pskb_may_pull(skb, needed)) { 106 /* packet is too short to hold the addresses it claims 107 to hold */ 108 rc = -1; 109 goto empty; 110 } 111 112 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 113 114 empty: 115 *called_addr->x25_addr = 0; 116 *calling_addr->x25_addr = 0; 117 118 return rc; 119 } 120 121 122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 123 struct x25_address *calling_addr) 124 { 125 unsigned int called_len, calling_len; 126 char *called, *calling; 127 unsigned int i; 128 129 called_len = (*p >> 0) & 0x0F; 130 calling_len = (*p >> 4) & 0x0F; 131 132 called = called_addr->x25_addr; 133 calling = calling_addr->x25_addr; 134 p++; 135 136 for (i = 0; i < (called_len + calling_len); i++) { 137 if (i < called_len) { 138 if (i % 2 != 0) { 139 *called++ = ((*p >> 0) & 0x0F) + '0'; 140 p++; 141 } else { 142 *called++ = ((*p >> 4) & 0x0F) + '0'; 143 } 144 } else { 145 if (i % 2 != 0) { 146 *calling++ = ((*p >> 0) & 0x0F) + '0'; 147 p++; 148 } else { 149 *calling++ = ((*p >> 4) & 0x0F) + '0'; 150 } 151 } 152 } 153 154 *called = *calling = '\0'; 155 156 return 1 + (called_len + calling_len + 1) / 2; 157 } 158 159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 160 struct x25_address *calling_addr) 161 { 162 unsigned int called_len, calling_len; 163 char *called, *calling; 164 int i; 165 166 called = called_addr->x25_addr; 167 calling = calling_addr->x25_addr; 168 169 called_len = strlen(called); 170 calling_len = strlen(calling); 171 172 *p++ = (calling_len << 4) | (called_len << 0); 173 174 for (i = 0; i < (called_len + calling_len); i++) { 175 if (i < called_len) { 176 if (i % 2 != 0) { 177 *p |= (*called++ - '0') << 0; 178 p++; 179 } else { 180 *p = 0x00; 181 *p |= (*called++ - '0') << 4; 182 } 183 } else { 184 if (i % 2 != 0) { 185 *p |= (*calling++ - '0') << 0; 186 p++; 187 } else { 188 *p = 0x00; 189 *p |= (*calling++ - '0') << 4; 190 } 191 } 192 } 193 194 return 1 + (called_len + calling_len + 1) / 2; 195 } 196 197 /* 198 * Socket removal during an interrupt is now safe. 199 */ 200 static void x25_remove_socket(struct sock *sk) 201 { 202 write_lock_bh(&x25_list_lock); 203 sk_del_node_init(sk); 204 write_unlock_bh(&x25_list_lock); 205 } 206 207 /* 208 * Kill all bound sockets on a dropped device. 209 */ 210 static void x25_kill_by_device(struct net_device *dev) 211 { 212 struct sock *s; 213 214 write_lock_bh(&x25_list_lock); 215 216 sk_for_each(s, &x25_list) 217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 218 x25_disconnect(s, ENETUNREACH, 0, 0); 219 220 write_unlock_bh(&x25_list_lock); 221 } 222 223 /* 224 * Handle device status changes. 225 */ 226 static int x25_device_event(struct notifier_block *this, unsigned long event, 227 void *ptr) 228 { 229 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 230 struct x25_neigh *nb; 231 232 if (!net_eq(dev_net(dev), &init_net)) 233 return NOTIFY_DONE; 234 235 if (dev->type == ARPHRD_X25 236 #if IS_ENABLED(CONFIG_LLC) 237 || dev->type == ARPHRD_ETHER 238 #endif 239 ) { 240 switch (event) { 241 case NETDEV_UP: 242 x25_link_device_up(dev); 243 break; 244 case NETDEV_GOING_DOWN: 245 nb = x25_get_neigh(dev); 246 if (nb) { 247 x25_terminate_link(nb); 248 x25_neigh_put(nb); 249 } 250 break; 251 case NETDEV_DOWN: 252 x25_kill_by_device(dev); 253 x25_route_device_down(dev); 254 x25_link_device_down(dev); 255 break; 256 } 257 } 258 259 return NOTIFY_DONE; 260 } 261 262 /* 263 * Add a socket to the bound sockets list. 264 */ 265 static void x25_insert_socket(struct sock *sk) 266 { 267 write_lock_bh(&x25_list_lock); 268 sk_add_node(sk, &x25_list); 269 write_unlock_bh(&x25_list_lock); 270 } 271 272 /* 273 * Find a socket that wants to accept the Call Request we just 274 * received. Check the full list for an address/cud match. 275 * If no cuds match return the next_best thing, an address match. 276 * Note: if a listening socket has cud set it must only get calls 277 * with matching cud. 278 */ 279 static struct sock *x25_find_listener(struct x25_address *addr, 280 struct sk_buff *skb) 281 { 282 struct sock *s; 283 struct sock *next_best; 284 285 read_lock_bh(&x25_list_lock); 286 next_best = NULL; 287 288 sk_for_each(s, &x25_list) 289 if ((!strcmp(addr->x25_addr, 290 x25_sk(s)->source_addr.x25_addr) || 291 !strcmp(x25_sk(s)->source_addr.x25_addr, 292 null_x25_address.x25_addr)) && 293 s->sk_state == TCP_LISTEN) { 294 /* 295 * Found a listening socket, now check the incoming 296 * call user data vs this sockets call user data 297 */ 298 if (x25_sk(s)->cudmatchlength > 0 && 299 skb->len >= x25_sk(s)->cudmatchlength) { 300 if((memcmp(x25_sk(s)->calluserdata.cuddata, 301 skb->data, 302 x25_sk(s)->cudmatchlength)) == 0) { 303 sock_hold(s); 304 goto found; 305 } 306 } else 307 next_best = s; 308 } 309 if (next_best) { 310 s = next_best; 311 sock_hold(s); 312 goto found; 313 } 314 s = NULL; 315 found: 316 read_unlock_bh(&x25_list_lock); 317 return s; 318 } 319 320 /* 321 * Find a connected X.25 socket given my LCI and neighbour. 322 */ 323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 324 { 325 struct sock *s; 326 327 sk_for_each(s, &x25_list) 328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 329 sock_hold(s); 330 goto found; 331 } 332 s = NULL; 333 found: 334 return s; 335 } 336 337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 338 { 339 struct sock *s; 340 341 read_lock_bh(&x25_list_lock); 342 s = __x25_find_socket(lci, nb); 343 read_unlock_bh(&x25_list_lock); 344 return s; 345 } 346 347 /* 348 * Find a unique LCI for a given device. 349 */ 350 static unsigned int x25_new_lci(struct x25_neigh *nb) 351 { 352 unsigned int lci = 1; 353 struct sock *sk; 354 355 while ((sk = x25_find_socket(lci, nb)) != NULL) { 356 sock_put(sk); 357 if (++lci == 4096) { 358 lci = 0; 359 break; 360 } 361 cond_resched(); 362 } 363 364 return lci; 365 } 366 367 /* 368 * Deferred destroy. 369 */ 370 static void __x25_destroy_socket(struct sock *); 371 372 /* 373 * handler for deferred kills. 374 */ 375 static void x25_destroy_timer(struct timer_list *t) 376 { 377 struct sock *sk = from_timer(sk, t, sk_timer); 378 379 x25_destroy_socket_from_timer(sk); 380 } 381 382 /* 383 * This is called from user mode and the timers. Thus it protects itself 384 * against interrupt users but doesn't worry about being called during 385 * work. Once it is removed from the queue no interrupt or bottom half 386 * will touch it and we are (fairly 8-) ) safe. 387 * Not static as it's used by the timer 388 */ 389 static void __x25_destroy_socket(struct sock *sk) 390 { 391 struct sk_buff *skb; 392 393 x25_stop_heartbeat(sk); 394 x25_stop_timer(sk); 395 396 x25_remove_socket(sk); 397 x25_clear_queues(sk); /* Flush the queues */ 398 399 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 400 if (skb->sk != sk) { /* A pending connection */ 401 /* 402 * Queue the unaccepted socket for death 403 */ 404 skb->sk->sk_state = TCP_LISTEN; 405 sock_set_flag(skb->sk, SOCK_DEAD); 406 x25_start_heartbeat(skb->sk); 407 x25_sk(skb->sk)->state = X25_STATE_0; 408 } 409 410 kfree_skb(skb); 411 } 412 413 if (sk_has_allocations(sk)) { 414 /* Defer: outstanding buffers */ 415 sk->sk_timer.expires = jiffies + 10 * HZ; 416 sk->sk_timer.function = x25_destroy_timer; 417 add_timer(&sk->sk_timer); 418 } else { 419 /* drop last reference so sock_put will free */ 420 __sock_put(sk); 421 } 422 } 423 424 void x25_destroy_socket_from_timer(struct sock *sk) 425 { 426 sock_hold(sk); 427 bh_lock_sock(sk); 428 __x25_destroy_socket(sk); 429 bh_unlock_sock(sk); 430 sock_put(sk); 431 } 432 433 /* 434 * Handling for system calls applied via the various interfaces to a 435 * X.25 socket object. 436 */ 437 438 static int x25_setsockopt(struct socket *sock, int level, int optname, 439 char __user *optval, unsigned int optlen) 440 { 441 int opt; 442 struct sock *sk = sock->sk; 443 int rc = -ENOPROTOOPT; 444 445 if (level != SOL_X25 || optname != X25_QBITINCL) 446 goto out; 447 448 rc = -EINVAL; 449 if (optlen < sizeof(int)) 450 goto out; 451 452 rc = -EFAULT; 453 if (get_user(opt, (int __user *)optval)) 454 goto out; 455 456 if (opt) 457 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 458 else 459 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 460 rc = 0; 461 out: 462 return rc; 463 } 464 465 static int x25_getsockopt(struct socket *sock, int level, int optname, 466 char __user *optval, int __user *optlen) 467 { 468 struct sock *sk = sock->sk; 469 int val, len, rc = -ENOPROTOOPT; 470 471 if (level != SOL_X25 || optname != X25_QBITINCL) 472 goto out; 473 474 rc = -EFAULT; 475 if (get_user(len, optlen)) 476 goto out; 477 478 len = min_t(unsigned int, len, sizeof(int)); 479 480 rc = -EINVAL; 481 if (len < 0) 482 goto out; 483 484 rc = -EFAULT; 485 if (put_user(len, optlen)) 486 goto out; 487 488 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 489 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 490 out: 491 return rc; 492 } 493 494 static int x25_listen(struct socket *sock, int backlog) 495 { 496 struct sock *sk = sock->sk; 497 int rc = -EOPNOTSUPP; 498 499 lock_sock(sk); 500 if (sk->sk_state != TCP_LISTEN) { 501 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 502 sk->sk_max_ack_backlog = backlog; 503 sk->sk_state = TCP_LISTEN; 504 rc = 0; 505 } 506 release_sock(sk); 507 508 return rc; 509 } 510 511 static struct proto x25_proto = { 512 .name = "X25", 513 .owner = THIS_MODULE, 514 .obj_size = sizeof(struct x25_sock), 515 }; 516 517 static struct sock *x25_alloc_socket(struct net *net, int kern) 518 { 519 struct x25_sock *x25; 520 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 521 522 if (!sk) 523 goto out; 524 525 sock_init_data(NULL, sk); 526 527 x25 = x25_sk(sk); 528 skb_queue_head_init(&x25->ack_queue); 529 skb_queue_head_init(&x25->fragment_queue); 530 skb_queue_head_init(&x25->interrupt_in_queue); 531 skb_queue_head_init(&x25->interrupt_out_queue); 532 out: 533 return sk; 534 } 535 536 static int x25_create(struct net *net, struct socket *sock, int protocol, 537 int kern) 538 { 539 struct sock *sk; 540 struct x25_sock *x25; 541 int rc = -EAFNOSUPPORT; 542 543 if (!net_eq(net, &init_net)) 544 goto out; 545 546 rc = -ESOCKTNOSUPPORT; 547 if (sock->type != SOCK_SEQPACKET) 548 goto out; 549 550 rc = -EINVAL; 551 if (protocol) 552 goto out; 553 554 rc = -ENOBUFS; 555 if ((sk = x25_alloc_socket(net, kern)) == NULL) 556 goto out; 557 558 x25 = x25_sk(sk); 559 560 sock_init_data(sock, sk); 561 562 x25_init_timers(sk); 563 564 sock->ops = &x25_proto_ops; 565 sk->sk_protocol = protocol; 566 sk->sk_backlog_rcv = x25_backlog_rcv; 567 568 x25->t21 = sysctl_x25_call_request_timeout; 569 x25->t22 = sysctl_x25_reset_request_timeout; 570 x25->t23 = sysctl_x25_clear_request_timeout; 571 x25->t2 = sysctl_x25_ack_holdback_timeout; 572 x25->state = X25_STATE_0; 573 x25->cudmatchlength = 0; 574 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 575 /* on call accept */ 576 577 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 578 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 579 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 580 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 581 x25->facilities.throughput = 0; /* by default don't negotiate 582 throughput */ 583 x25->facilities.reverse = X25_DEFAULT_REVERSE; 584 x25->dte_facilities.calling_len = 0; 585 x25->dte_facilities.called_len = 0; 586 memset(x25->dte_facilities.called_ae, '\0', 587 sizeof(x25->dte_facilities.called_ae)); 588 memset(x25->dte_facilities.calling_ae, '\0', 589 sizeof(x25->dte_facilities.calling_ae)); 590 591 rc = 0; 592 out: 593 return rc; 594 } 595 596 static struct sock *x25_make_new(struct sock *osk) 597 { 598 struct sock *sk = NULL; 599 struct x25_sock *x25, *ox25; 600 601 if (osk->sk_type != SOCK_SEQPACKET) 602 goto out; 603 604 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 605 goto out; 606 607 x25 = x25_sk(sk); 608 609 sk->sk_type = osk->sk_type; 610 sk->sk_priority = osk->sk_priority; 611 sk->sk_protocol = osk->sk_protocol; 612 sk->sk_rcvbuf = osk->sk_rcvbuf; 613 sk->sk_sndbuf = osk->sk_sndbuf; 614 sk->sk_state = TCP_ESTABLISHED; 615 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 616 sock_copy_flags(sk, osk); 617 618 ox25 = x25_sk(osk); 619 x25->t21 = ox25->t21; 620 x25->t22 = ox25->t22; 621 x25->t23 = ox25->t23; 622 x25->t2 = ox25->t2; 623 x25->flags = ox25->flags; 624 x25->facilities = ox25->facilities; 625 x25->dte_facilities = ox25->dte_facilities; 626 x25->cudmatchlength = ox25->cudmatchlength; 627 628 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 629 x25_init_timers(sk); 630 out: 631 return sk; 632 } 633 634 static int x25_release(struct socket *sock) 635 { 636 struct sock *sk = sock->sk; 637 struct x25_sock *x25; 638 639 if (!sk) 640 return 0; 641 642 x25 = x25_sk(sk); 643 644 sock_hold(sk); 645 lock_sock(sk); 646 switch (x25->state) { 647 648 case X25_STATE_0: 649 case X25_STATE_2: 650 x25_disconnect(sk, 0, 0, 0); 651 __x25_destroy_socket(sk); 652 goto out; 653 654 case X25_STATE_1: 655 case X25_STATE_3: 656 case X25_STATE_4: 657 x25_clear_queues(sk); 658 x25_write_internal(sk, X25_CLEAR_REQUEST); 659 x25_start_t23timer(sk); 660 x25->state = X25_STATE_2; 661 sk->sk_state = TCP_CLOSE; 662 sk->sk_shutdown |= SEND_SHUTDOWN; 663 sk->sk_state_change(sk); 664 sock_set_flag(sk, SOCK_DEAD); 665 sock_set_flag(sk, SOCK_DESTROY); 666 break; 667 } 668 669 sock_orphan(sk); 670 out: 671 release_sock(sk); 672 sock_put(sk); 673 return 0; 674 } 675 676 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 677 { 678 struct sock *sk = sock->sk; 679 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 680 int len, i, rc = 0; 681 682 if (addr_len != sizeof(struct sockaddr_x25) || 683 addr->sx25_family != AF_X25) { 684 rc = -EINVAL; 685 goto out; 686 } 687 688 /* check for the null_x25_address */ 689 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { 690 691 len = strlen(addr->sx25_addr.x25_addr); 692 for (i = 0; i < len; i++) { 693 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 694 rc = -EINVAL; 695 goto out; 696 } 697 } 698 } 699 700 lock_sock(sk); 701 if (sock_flag(sk, SOCK_ZAPPED)) { 702 x25_sk(sk)->source_addr = addr->sx25_addr; 703 x25_insert_socket(sk); 704 sock_reset_flag(sk, SOCK_ZAPPED); 705 } else { 706 rc = -EINVAL; 707 } 708 release_sock(sk); 709 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 710 out: 711 return rc; 712 } 713 714 static int x25_wait_for_connection_establishment(struct sock *sk) 715 { 716 DECLARE_WAITQUEUE(wait, current); 717 int rc; 718 719 add_wait_queue_exclusive(sk_sleep(sk), &wait); 720 for (;;) { 721 __set_current_state(TASK_INTERRUPTIBLE); 722 rc = -ERESTARTSYS; 723 if (signal_pending(current)) 724 break; 725 rc = sock_error(sk); 726 if (rc) { 727 sk->sk_socket->state = SS_UNCONNECTED; 728 break; 729 } 730 rc = 0; 731 if (sk->sk_state != TCP_ESTABLISHED) { 732 release_sock(sk); 733 schedule(); 734 lock_sock(sk); 735 } else 736 break; 737 } 738 __set_current_state(TASK_RUNNING); 739 remove_wait_queue(sk_sleep(sk), &wait); 740 return rc; 741 } 742 743 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 744 int addr_len, int flags) 745 { 746 struct sock *sk = sock->sk; 747 struct x25_sock *x25 = x25_sk(sk); 748 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 749 struct x25_route *rt; 750 int rc = 0; 751 752 lock_sock(sk); 753 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 754 sock->state = SS_CONNECTED; 755 goto out; /* Connect completed during a ERESTARTSYS event */ 756 } 757 758 rc = -ECONNREFUSED; 759 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 760 sock->state = SS_UNCONNECTED; 761 goto out; 762 } 763 764 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 765 if (sk->sk_state == TCP_ESTABLISHED) 766 goto out; 767 768 sk->sk_state = TCP_CLOSE; 769 sock->state = SS_UNCONNECTED; 770 771 rc = -EINVAL; 772 if (addr_len != sizeof(struct sockaddr_x25) || 773 addr->sx25_family != AF_X25) 774 goto out; 775 776 rc = -ENETUNREACH; 777 rt = x25_get_route(&addr->sx25_addr); 778 if (!rt) 779 goto out; 780 781 x25->neighbour = x25_get_neigh(rt->dev); 782 if (!x25->neighbour) 783 goto out_put_route; 784 785 x25_limit_facilities(&x25->facilities, x25->neighbour); 786 787 x25->lci = x25_new_lci(x25->neighbour); 788 if (!x25->lci) 789 goto out_put_neigh; 790 791 rc = -EINVAL; 792 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 793 goto out_put_neigh; 794 795 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 796 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 797 798 x25->dest_addr = addr->sx25_addr; 799 800 /* Move to connecting socket, start sending Connect Requests */ 801 sock->state = SS_CONNECTING; 802 sk->sk_state = TCP_SYN_SENT; 803 804 x25->state = X25_STATE_1; 805 806 x25_write_internal(sk, X25_CALL_REQUEST); 807 808 x25_start_heartbeat(sk); 809 x25_start_t21timer(sk); 810 811 /* Now the loop */ 812 rc = -EINPROGRESS; 813 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 814 goto out_put_neigh; 815 816 rc = x25_wait_for_connection_establishment(sk); 817 if (rc) 818 goto out_put_neigh; 819 820 sock->state = SS_CONNECTED; 821 rc = 0; 822 out_put_neigh: 823 if (rc) 824 x25_neigh_put(x25->neighbour); 825 out_put_route: 826 x25_route_put(rt); 827 out: 828 release_sock(sk); 829 return rc; 830 } 831 832 static int x25_wait_for_data(struct sock *sk, long timeout) 833 { 834 DECLARE_WAITQUEUE(wait, current); 835 int rc = 0; 836 837 add_wait_queue_exclusive(sk_sleep(sk), &wait); 838 for (;;) { 839 __set_current_state(TASK_INTERRUPTIBLE); 840 if (sk->sk_shutdown & RCV_SHUTDOWN) 841 break; 842 rc = -ERESTARTSYS; 843 if (signal_pending(current)) 844 break; 845 rc = -EAGAIN; 846 if (!timeout) 847 break; 848 rc = 0; 849 if (skb_queue_empty(&sk->sk_receive_queue)) { 850 release_sock(sk); 851 timeout = schedule_timeout(timeout); 852 lock_sock(sk); 853 } else 854 break; 855 } 856 __set_current_state(TASK_RUNNING); 857 remove_wait_queue(sk_sleep(sk), &wait); 858 return rc; 859 } 860 861 static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 862 bool kern) 863 { 864 struct sock *sk = sock->sk; 865 struct sock *newsk; 866 struct sk_buff *skb; 867 int rc = -EINVAL; 868 869 if (!sk) 870 goto out; 871 872 rc = -EOPNOTSUPP; 873 if (sk->sk_type != SOCK_SEQPACKET) 874 goto out; 875 876 lock_sock(sk); 877 rc = -EINVAL; 878 if (sk->sk_state != TCP_LISTEN) 879 goto out2; 880 881 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 882 if (rc) 883 goto out2; 884 skb = skb_dequeue(&sk->sk_receive_queue); 885 rc = -EINVAL; 886 if (!skb->sk) 887 goto out2; 888 newsk = skb->sk; 889 sock_graft(newsk, newsock); 890 891 /* Now attach up the new socket */ 892 skb->sk = NULL; 893 kfree_skb(skb); 894 sk->sk_ack_backlog--; 895 newsock->state = SS_CONNECTED; 896 rc = 0; 897 out2: 898 release_sock(sk); 899 out: 900 return rc; 901 } 902 903 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 904 int peer) 905 { 906 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 907 struct sock *sk = sock->sk; 908 struct x25_sock *x25 = x25_sk(sk); 909 int rc = 0; 910 911 if (peer) { 912 if (sk->sk_state != TCP_ESTABLISHED) { 913 rc = -ENOTCONN; 914 goto out; 915 } 916 sx25->sx25_addr = x25->dest_addr; 917 } else 918 sx25->sx25_addr = x25->source_addr; 919 920 sx25->sx25_family = AF_X25; 921 rc = sizeof(*sx25); 922 923 out: 924 return rc; 925 } 926 927 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 928 unsigned int lci) 929 { 930 struct sock *sk; 931 struct sock *make; 932 struct x25_sock *makex25; 933 struct x25_address source_addr, dest_addr; 934 struct x25_facilities facilities; 935 struct x25_dte_facilities dte_facilities; 936 int len, addr_len, rc; 937 938 /* 939 * Remove the LCI and frame type. 940 */ 941 skb_pull(skb, X25_STD_MIN_LEN); 942 943 /* 944 * Extract the X.25 addresses and convert them to ASCII strings, 945 * and remove them. 946 * 947 * Address block is mandatory in call request packets 948 */ 949 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 950 if (addr_len <= 0) 951 goto out_clear_request; 952 skb_pull(skb, addr_len); 953 954 /* 955 * Get the length of the facilities, skip past them for the moment 956 * get the call user data because this is needed to determine 957 * the correct listener 958 * 959 * Facilities length is mandatory in call request packets 960 */ 961 if (!pskb_may_pull(skb, 1)) 962 goto out_clear_request; 963 len = skb->data[0] + 1; 964 if (!pskb_may_pull(skb, len)) 965 goto out_clear_request; 966 skb_pull(skb,len); 967 968 /* 969 * Ensure that the amount of call user data is valid. 970 */ 971 if (skb->len > X25_MAX_CUD_LEN) 972 goto out_clear_request; 973 974 /* 975 * Get all the call user data so it can be used in 976 * x25_find_listener and skb_copy_from_linear_data up ahead. 977 */ 978 if (!pskb_may_pull(skb, skb->len)) 979 goto out_clear_request; 980 981 /* 982 * Find a listener for the particular address/cud pair. 983 */ 984 sk = x25_find_listener(&source_addr,skb); 985 skb_push(skb,len); 986 987 if (sk != NULL && sk_acceptq_is_full(sk)) { 988 goto out_sock_put; 989 } 990 991 /* 992 * We dont have any listeners for this incoming call. 993 * Try forwarding it. 994 */ 995 if (sk == NULL) { 996 skb_push(skb, addr_len + X25_STD_MIN_LEN); 997 if (sysctl_x25_forward && 998 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 999 { 1000 /* Call was forwarded, dont process it any more */ 1001 kfree_skb(skb); 1002 rc = 1; 1003 goto out; 1004 } else { 1005 /* No listeners, can't forward, clear the call */ 1006 goto out_clear_request; 1007 } 1008 } 1009 1010 /* 1011 * Try to reach a compromise on the requested facilities. 1012 */ 1013 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1014 if (len == -1) 1015 goto out_sock_put; 1016 1017 /* 1018 * current neighbour/link might impose additional limits 1019 * on certain facilties 1020 */ 1021 1022 x25_limit_facilities(&facilities, nb); 1023 1024 /* 1025 * Try to create a new socket. 1026 */ 1027 make = x25_make_new(sk); 1028 if (!make) 1029 goto out_sock_put; 1030 1031 /* 1032 * Remove the facilities 1033 */ 1034 skb_pull(skb, len); 1035 1036 skb->sk = make; 1037 make->sk_state = TCP_ESTABLISHED; 1038 1039 makex25 = x25_sk(make); 1040 makex25->lci = lci; 1041 makex25->dest_addr = dest_addr; 1042 makex25->source_addr = source_addr; 1043 makex25->neighbour = nb; 1044 makex25->facilities = facilities; 1045 makex25->dte_facilities= dte_facilities; 1046 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1047 /* ensure no reverse facil on accept */ 1048 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1049 /* ensure no calling address extension on accept */ 1050 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1051 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1052 1053 /* Normally all calls are accepted immediately */ 1054 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1055 x25_write_internal(make, X25_CALL_ACCEPTED); 1056 makex25->state = X25_STATE_3; 1057 } 1058 1059 /* 1060 * Incoming Call User Data. 1061 */ 1062 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1063 makex25->calluserdata.cudlength = skb->len; 1064 1065 sk->sk_ack_backlog++; 1066 1067 x25_insert_socket(make); 1068 1069 skb_queue_head(&sk->sk_receive_queue, skb); 1070 1071 x25_start_heartbeat(make); 1072 1073 if (!sock_flag(sk, SOCK_DEAD)) 1074 sk->sk_data_ready(sk); 1075 rc = 1; 1076 sock_put(sk); 1077 out: 1078 return rc; 1079 out_sock_put: 1080 sock_put(sk); 1081 out_clear_request: 1082 rc = 0; 1083 x25_transmit_clear_request(nb, lci, 0x01); 1084 goto out; 1085 } 1086 1087 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1088 { 1089 struct sock *sk = sock->sk; 1090 struct x25_sock *x25 = x25_sk(sk); 1091 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1092 struct sockaddr_x25 sx25; 1093 struct sk_buff *skb; 1094 unsigned char *asmptr; 1095 int noblock = msg->msg_flags & MSG_DONTWAIT; 1096 size_t size; 1097 int qbit = 0, rc = -EINVAL; 1098 1099 lock_sock(sk); 1100 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1101 goto out; 1102 1103 /* we currently don't support segmented records at the user interface */ 1104 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1105 goto out; 1106 1107 rc = -EADDRNOTAVAIL; 1108 if (sock_flag(sk, SOCK_ZAPPED)) 1109 goto out; 1110 1111 rc = -EPIPE; 1112 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1113 send_sig(SIGPIPE, current, 0); 1114 goto out; 1115 } 1116 1117 rc = -ENETUNREACH; 1118 if (!x25->neighbour) 1119 goto out; 1120 1121 if (usx25) { 1122 rc = -EINVAL; 1123 if (msg->msg_namelen < sizeof(sx25)) 1124 goto out; 1125 memcpy(&sx25, usx25, sizeof(sx25)); 1126 rc = -EISCONN; 1127 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1128 goto out; 1129 rc = -EINVAL; 1130 if (sx25.sx25_family != AF_X25) 1131 goto out; 1132 } else { 1133 /* 1134 * FIXME 1003.1g - if the socket is like this because 1135 * it has become closed (not started closed) we ought 1136 * to SIGPIPE, EPIPE; 1137 */ 1138 rc = -ENOTCONN; 1139 if (sk->sk_state != TCP_ESTABLISHED) 1140 goto out; 1141 1142 sx25.sx25_family = AF_X25; 1143 sx25.sx25_addr = x25->dest_addr; 1144 } 1145 1146 /* Sanity check the packet size */ 1147 if (len > 65535) { 1148 rc = -EMSGSIZE; 1149 goto out; 1150 } 1151 1152 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1153 1154 /* Build a packet */ 1155 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1156 1157 if ((msg->msg_flags & MSG_OOB) && len > 32) 1158 len = 32; 1159 1160 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1161 1162 release_sock(sk); 1163 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1164 lock_sock(sk); 1165 if (!skb) 1166 goto out; 1167 X25_SKB_CB(skb)->flags = msg->msg_flags; 1168 1169 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1170 1171 /* 1172 * Put the data on the end 1173 */ 1174 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1175 1176 skb_reset_transport_header(skb); 1177 skb_put(skb, len); 1178 1179 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1180 if (rc) 1181 goto out_kfree_skb; 1182 1183 /* 1184 * If the Q BIT Include socket option is in force, the first 1185 * byte of the user data is the logical value of the Q Bit. 1186 */ 1187 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1188 if (!pskb_may_pull(skb, 1)) 1189 goto out_kfree_skb; 1190 1191 qbit = skb->data[0]; 1192 skb_pull(skb, 1); 1193 } 1194 1195 /* 1196 * Push down the X.25 header 1197 */ 1198 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1199 1200 if (msg->msg_flags & MSG_OOB) { 1201 if (x25->neighbour->extended) { 1202 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1203 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1204 *asmptr++ = (x25->lci >> 0) & 0xFF; 1205 *asmptr++ = X25_INTERRUPT; 1206 } else { 1207 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1208 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1209 *asmptr++ = (x25->lci >> 0) & 0xFF; 1210 *asmptr++ = X25_INTERRUPT; 1211 } 1212 } else { 1213 if (x25->neighbour->extended) { 1214 /* Build an Extended X.25 header */ 1215 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1216 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1217 *asmptr++ = (x25->lci >> 0) & 0xFF; 1218 *asmptr++ = X25_DATA; 1219 *asmptr++ = X25_DATA; 1220 } else { 1221 /* Build an Standard X.25 header */ 1222 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1223 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1224 *asmptr++ = (x25->lci >> 0) & 0xFF; 1225 *asmptr++ = X25_DATA; 1226 } 1227 1228 if (qbit) 1229 skb->data[0] |= X25_Q_BIT; 1230 } 1231 1232 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1233 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1234 1235 rc = -ENOTCONN; 1236 if (sk->sk_state != TCP_ESTABLISHED) 1237 goto out_kfree_skb; 1238 1239 if (msg->msg_flags & MSG_OOB) 1240 skb_queue_tail(&x25->interrupt_out_queue, skb); 1241 else { 1242 rc = x25_output(sk, skb); 1243 len = rc; 1244 if (rc < 0) 1245 kfree_skb(skb); 1246 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1247 len++; 1248 } 1249 1250 x25_kick(sk); 1251 rc = len; 1252 out: 1253 release_sock(sk); 1254 return rc; 1255 out_kfree_skb: 1256 kfree_skb(skb); 1257 goto out; 1258 } 1259 1260 1261 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1262 int flags) 1263 { 1264 struct sock *sk = sock->sk; 1265 struct x25_sock *x25 = x25_sk(sk); 1266 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1267 size_t copied; 1268 int qbit, header_len; 1269 struct sk_buff *skb; 1270 unsigned char *asmptr; 1271 int rc = -ENOTCONN; 1272 1273 lock_sock(sk); 1274 1275 if (x25->neighbour == NULL) 1276 goto out; 1277 1278 header_len = x25->neighbour->extended ? 1279 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1280 1281 /* 1282 * This works for seqpacket too. The receiver has ordered the queue for 1283 * us! We do one quick check first though 1284 */ 1285 if (sk->sk_state != TCP_ESTABLISHED) 1286 goto out; 1287 1288 if (flags & MSG_OOB) { 1289 rc = -EINVAL; 1290 if (sock_flag(sk, SOCK_URGINLINE) || 1291 !skb_peek(&x25->interrupt_in_queue)) 1292 goto out; 1293 1294 skb = skb_dequeue(&x25->interrupt_in_queue); 1295 1296 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1297 goto out_free_dgram; 1298 1299 skb_pull(skb, X25_STD_MIN_LEN); 1300 1301 /* 1302 * No Q bit information on Interrupt data. 1303 */ 1304 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1305 asmptr = skb_push(skb, 1); 1306 *asmptr = 0x00; 1307 } 1308 1309 msg->msg_flags |= MSG_OOB; 1310 } else { 1311 /* Now we can treat all alike */ 1312 release_sock(sk); 1313 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1314 flags & MSG_DONTWAIT, &rc); 1315 lock_sock(sk); 1316 if (!skb) 1317 goto out; 1318 1319 if (!pskb_may_pull(skb, header_len)) 1320 goto out_free_dgram; 1321 1322 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1323 1324 skb_pull(skb, header_len); 1325 1326 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1327 asmptr = skb_push(skb, 1); 1328 *asmptr = qbit; 1329 } 1330 } 1331 1332 skb_reset_transport_header(skb); 1333 copied = skb->len; 1334 1335 if (copied > size) { 1336 copied = size; 1337 msg->msg_flags |= MSG_TRUNC; 1338 } 1339 1340 /* Currently, each datagram always contains a complete record */ 1341 msg->msg_flags |= MSG_EOR; 1342 1343 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1344 if (rc) 1345 goto out_free_dgram; 1346 1347 if (sx25) { 1348 sx25->sx25_family = AF_X25; 1349 sx25->sx25_addr = x25->dest_addr; 1350 msg->msg_namelen = sizeof(*sx25); 1351 } 1352 1353 x25_check_rbuf(sk); 1354 rc = copied; 1355 out_free_dgram: 1356 skb_free_datagram(sk, skb); 1357 out: 1358 release_sock(sk); 1359 return rc; 1360 } 1361 1362 1363 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1364 { 1365 struct sock *sk = sock->sk; 1366 struct x25_sock *x25 = x25_sk(sk); 1367 void __user *argp = (void __user *)arg; 1368 int rc; 1369 1370 switch (cmd) { 1371 case TIOCOUTQ: { 1372 int amount; 1373 1374 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1375 if (amount < 0) 1376 amount = 0; 1377 rc = put_user(amount, (unsigned int __user *)argp); 1378 break; 1379 } 1380 1381 case TIOCINQ: { 1382 struct sk_buff *skb; 1383 int amount = 0; 1384 /* 1385 * These two are safe on a single CPU system as 1386 * only user tasks fiddle here 1387 */ 1388 lock_sock(sk); 1389 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1390 amount = skb->len; 1391 release_sock(sk); 1392 rc = put_user(amount, (unsigned int __user *)argp); 1393 break; 1394 } 1395 1396 case SIOCGSTAMP: 1397 rc = -EINVAL; 1398 if (sk) 1399 rc = sock_get_timestamp(sk, 1400 (struct timeval __user *)argp); 1401 break; 1402 case SIOCGSTAMPNS: 1403 rc = -EINVAL; 1404 if (sk) 1405 rc = sock_get_timestampns(sk, 1406 (struct timespec __user *)argp); 1407 break; 1408 case SIOCGIFADDR: 1409 case SIOCSIFADDR: 1410 case SIOCGIFDSTADDR: 1411 case SIOCSIFDSTADDR: 1412 case SIOCGIFBRDADDR: 1413 case SIOCSIFBRDADDR: 1414 case SIOCGIFNETMASK: 1415 case SIOCSIFNETMASK: 1416 case SIOCGIFMETRIC: 1417 case SIOCSIFMETRIC: 1418 rc = -EINVAL; 1419 break; 1420 case SIOCADDRT: 1421 case SIOCDELRT: 1422 rc = -EPERM; 1423 if (!capable(CAP_NET_ADMIN)) 1424 break; 1425 rc = x25_route_ioctl(cmd, argp); 1426 break; 1427 case SIOCX25GSUBSCRIP: 1428 rc = x25_subscr_ioctl(cmd, argp); 1429 break; 1430 case SIOCX25SSUBSCRIP: 1431 rc = -EPERM; 1432 if (!capable(CAP_NET_ADMIN)) 1433 break; 1434 rc = x25_subscr_ioctl(cmd, argp); 1435 break; 1436 case SIOCX25GFACILITIES: { 1437 lock_sock(sk); 1438 rc = copy_to_user(argp, &x25->facilities, 1439 sizeof(x25->facilities)) 1440 ? -EFAULT : 0; 1441 release_sock(sk); 1442 break; 1443 } 1444 1445 case SIOCX25SFACILITIES: { 1446 struct x25_facilities facilities; 1447 rc = -EFAULT; 1448 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1449 break; 1450 rc = -EINVAL; 1451 lock_sock(sk); 1452 if (sk->sk_state != TCP_LISTEN && 1453 sk->sk_state != TCP_CLOSE) 1454 goto out_fac_release; 1455 if (facilities.pacsize_in < X25_PS16 || 1456 facilities.pacsize_in > X25_PS4096) 1457 goto out_fac_release; 1458 if (facilities.pacsize_out < X25_PS16 || 1459 facilities.pacsize_out > X25_PS4096) 1460 goto out_fac_release; 1461 if (facilities.winsize_in < 1 || 1462 facilities.winsize_in > 127) 1463 goto out_fac_release; 1464 if (facilities.throughput) { 1465 int out = facilities.throughput & 0xf0; 1466 int in = facilities.throughput & 0x0f; 1467 if (!out) 1468 facilities.throughput |= 1469 X25_DEFAULT_THROUGHPUT << 4; 1470 else if (out < 0x30 || out > 0xD0) 1471 goto out_fac_release; 1472 if (!in) 1473 facilities.throughput |= 1474 X25_DEFAULT_THROUGHPUT; 1475 else if (in < 0x03 || in > 0x0D) 1476 goto out_fac_release; 1477 } 1478 if (facilities.reverse && 1479 (facilities.reverse & 0x81) != 0x81) 1480 goto out_fac_release; 1481 x25->facilities = facilities; 1482 rc = 0; 1483 out_fac_release: 1484 release_sock(sk); 1485 break; 1486 } 1487 1488 case SIOCX25GDTEFACILITIES: { 1489 lock_sock(sk); 1490 rc = copy_to_user(argp, &x25->dte_facilities, 1491 sizeof(x25->dte_facilities)); 1492 release_sock(sk); 1493 if (rc) 1494 rc = -EFAULT; 1495 break; 1496 } 1497 1498 case SIOCX25SDTEFACILITIES: { 1499 struct x25_dte_facilities dtefacs; 1500 rc = -EFAULT; 1501 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1502 break; 1503 rc = -EINVAL; 1504 lock_sock(sk); 1505 if (sk->sk_state != TCP_LISTEN && 1506 sk->sk_state != TCP_CLOSE) 1507 goto out_dtefac_release; 1508 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1509 goto out_dtefac_release; 1510 if (dtefacs.called_len > X25_MAX_AE_LEN) 1511 goto out_dtefac_release; 1512 x25->dte_facilities = dtefacs; 1513 rc = 0; 1514 out_dtefac_release: 1515 release_sock(sk); 1516 break; 1517 } 1518 1519 case SIOCX25GCALLUSERDATA: { 1520 lock_sock(sk); 1521 rc = copy_to_user(argp, &x25->calluserdata, 1522 sizeof(x25->calluserdata)) 1523 ? -EFAULT : 0; 1524 release_sock(sk); 1525 break; 1526 } 1527 1528 case SIOCX25SCALLUSERDATA: { 1529 struct x25_calluserdata calluserdata; 1530 1531 rc = -EFAULT; 1532 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1533 break; 1534 rc = -EINVAL; 1535 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1536 break; 1537 lock_sock(sk); 1538 x25->calluserdata = calluserdata; 1539 release_sock(sk); 1540 rc = 0; 1541 break; 1542 } 1543 1544 case SIOCX25GCAUSEDIAG: { 1545 lock_sock(sk); 1546 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1547 ? -EFAULT : 0; 1548 release_sock(sk); 1549 break; 1550 } 1551 1552 case SIOCX25SCAUSEDIAG: { 1553 struct x25_causediag causediag; 1554 rc = -EFAULT; 1555 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1556 break; 1557 lock_sock(sk); 1558 x25->causediag = causediag; 1559 release_sock(sk); 1560 rc = 0; 1561 break; 1562 1563 } 1564 1565 case SIOCX25SCUDMATCHLEN: { 1566 struct x25_subaddr sub_addr; 1567 rc = -EINVAL; 1568 lock_sock(sk); 1569 if(sk->sk_state != TCP_CLOSE) 1570 goto out_cud_release; 1571 rc = -EFAULT; 1572 if (copy_from_user(&sub_addr, argp, 1573 sizeof(sub_addr))) 1574 goto out_cud_release; 1575 rc = -EINVAL; 1576 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1577 goto out_cud_release; 1578 x25->cudmatchlength = sub_addr.cudmatchlength; 1579 rc = 0; 1580 out_cud_release: 1581 release_sock(sk); 1582 break; 1583 } 1584 1585 case SIOCX25CALLACCPTAPPRV: { 1586 rc = -EINVAL; 1587 lock_sock(sk); 1588 if (sk->sk_state == TCP_CLOSE) { 1589 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1590 rc = 0; 1591 } 1592 release_sock(sk); 1593 break; 1594 } 1595 1596 case SIOCX25SENDCALLACCPT: { 1597 rc = -EINVAL; 1598 lock_sock(sk); 1599 if (sk->sk_state != TCP_ESTABLISHED) 1600 goto out_sendcallaccpt_release; 1601 /* must call accptapprv above */ 1602 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1603 goto out_sendcallaccpt_release; 1604 x25_write_internal(sk, X25_CALL_ACCEPTED); 1605 x25->state = X25_STATE_3; 1606 rc = 0; 1607 out_sendcallaccpt_release: 1608 release_sock(sk); 1609 break; 1610 } 1611 1612 default: 1613 rc = -ENOIOCTLCMD; 1614 break; 1615 } 1616 1617 return rc; 1618 } 1619 1620 static const struct net_proto_family x25_family_ops = { 1621 .family = AF_X25, 1622 .create = x25_create, 1623 .owner = THIS_MODULE, 1624 }; 1625 1626 #ifdef CONFIG_COMPAT 1627 static int compat_x25_subscr_ioctl(unsigned int cmd, 1628 struct compat_x25_subscrip_struct __user *x25_subscr32) 1629 { 1630 struct compat_x25_subscrip_struct x25_subscr; 1631 struct x25_neigh *nb; 1632 struct net_device *dev; 1633 int rc = -EINVAL; 1634 1635 rc = -EFAULT; 1636 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1637 goto out; 1638 1639 rc = -EINVAL; 1640 dev = x25_dev_get(x25_subscr.device); 1641 if (dev == NULL) 1642 goto out; 1643 1644 nb = x25_get_neigh(dev); 1645 if (nb == NULL) 1646 goto out_dev_put; 1647 1648 dev_put(dev); 1649 1650 if (cmd == SIOCX25GSUBSCRIP) { 1651 read_lock_bh(&x25_neigh_list_lock); 1652 x25_subscr.extended = nb->extended; 1653 x25_subscr.global_facil_mask = nb->global_facil_mask; 1654 read_unlock_bh(&x25_neigh_list_lock); 1655 rc = copy_to_user(x25_subscr32, &x25_subscr, 1656 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1657 } else { 1658 rc = -EINVAL; 1659 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1660 rc = 0; 1661 write_lock_bh(&x25_neigh_list_lock); 1662 nb->extended = x25_subscr.extended; 1663 nb->global_facil_mask = x25_subscr.global_facil_mask; 1664 write_unlock_bh(&x25_neigh_list_lock); 1665 } 1666 } 1667 x25_neigh_put(nb); 1668 out: 1669 return rc; 1670 out_dev_put: 1671 dev_put(dev); 1672 goto out; 1673 } 1674 1675 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1676 unsigned long arg) 1677 { 1678 void __user *argp = compat_ptr(arg); 1679 struct sock *sk = sock->sk; 1680 1681 int rc = -ENOIOCTLCMD; 1682 1683 switch(cmd) { 1684 case TIOCOUTQ: 1685 case TIOCINQ: 1686 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1687 break; 1688 case SIOCGSTAMP: 1689 rc = -EINVAL; 1690 if (sk) 1691 rc = compat_sock_get_timestamp(sk, 1692 (struct timeval __user*)argp); 1693 break; 1694 case SIOCGSTAMPNS: 1695 rc = -EINVAL; 1696 if (sk) 1697 rc = compat_sock_get_timestampns(sk, 1698 (struct timespec __user*)argp); 1699 break; 1700 case SIOCGIFADDR: 1701 case SIOCSIFADDR: 1702 case SIOCGIFDSTADDR: 1703 case SIOCSIFDSTADDR: 1704 case SIOCGIFBRDADDR: 1705 case SIOCSIFBRDADDR: 1706 case SIOCGIFNETMASK: 1707 case SIOCSIFNETMASK: 1708 case SIOCGIFMETRIC: 1709 case SIOCSIFMETRIC: 1710 rc = -EINVAL; 1711 break; 1712 case SIOCADDRT: 1713 case SIOCDELRT: 1714 rc = -EPERM; 1715 if (!capable(CAP_NET_ADMIN)) 1716 break; 1717 rc = x25_route_ioctl(cmd, argp); 1718 break; 1719 case SIOCX25GSUBSCRIP: 1720 rc = compat_x25_subscr_ioctl(cmd, argp); 1721 break; 1722 case SIOCX25SSUBSCRIP: 1723 rc = -EPERM; 1724 if (!capable(CAP_NET_ADMIN)) 1725 break; 1726 rc = compat_x25_subscr_ioctl(cmd, argp); 1727 break; 1728 case SIOCX25GFACILITIES: 1729 case SIOCX25SFACILITIES: 1730 case SIOCX25GDTEFACILITIES: 1731 case SIOCX25SDTEFACILITIES: 1732 case SIOCX25GCALLUSERDATA: 1733 case SIOCX25SCALLUSERDATA: 1734 case SIOCX25GCAUSEDIAG: 1735 case SIOCX25SCAUSEDIAG: 1736 case SIOCX25SCUDMATCHLEN: 1737 case SIOCX25CALLACCPTAPPRV: 1738 case SIOCX25SENDCALLACCPT: 1739 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1740 break; 1741 default: 1742 rc = -ENOIOCTLCMD; 1743 break; 1744 } 1745 return rc; 1746 } 1747 #endif 1748 1749 static const struct proto_ops x25_proto_ops = { 1750 .family = AF_X25, 1751 .owner = THIS_MODULE, 1752 .release = x25_release, 1753 .bind = x25_bind, 1754 .connect = x25_connect, 1755 .socketpair = sock_no_socketpair, 1756 .accept = x25_accept, 1757 .getname = x25_getname, 1758 .poll = datagram_poll, 1759 .ioctl = x25_ioctl, 1760 #ifdef CONFIG_COMPAT 1761 .compat_ioctl = compat_x25_ioctl, 1762 #endif 1763 .listen = x25_listen, 1764 .shutdown = sock_no_shutdown, 1765 .setsockopt = x25_setsockopt, 1766 .getsockopt = x25_getsockopt, 1767 .sendmsg = x25_sendmsg, 1768 .recvmsg = x25_recvmsg, 1769 .mmap = sock_no_mmap, 1770 .sendpage = sock_no_sendpage, 1771 }; 1772 1773 static struct packet_type x25_packet_type __read_mostly = { 1774 .type = cpu_to_be16(ETH_P_X25), 1775 .func = x25_lapb_receive_frame, 1776 }; 1777 1778 static struct notifier_block x25_dev_notifier = { 1779 .notifier_call = x25_device_event, 1780 }; 1781 1782 void x25_kill_by_neigh(struct x25_neigh *nb) 1783 { 1784 struct sock *s; 1785 1786 write_lock_bh(&x25_list_lock); 1787 1788 sk_for_each(s, &x25_list) 1789 if (x25_sk(s)->neighbour == nb) 1790 x25_disconnect(s, ENETUNREACH, 0, 0); 1791 1792 write_unlock_bh(&x25_list_lock); 1793 1794 /* Remove any related forwards */ 1795 x25_clear_forward_by_dev(nb->dev); 1796 } 1797 1798 static int __init x25_init(void) 1799 { 1800 int rc; 1801 1802 rc = proto_register(&x25_proto, 0); 1803 if (rc) 1804 goto out; 1805 1806 rc = sock_register(&x25_family_ops); 1807 if (rc) 1808 goto out_proto; 1809 1810 dev_add_pack(&x25_packet_type); 1811 1812 rc = register_netdevice_notifier(&x25_dev_notifier); 1813 if (rc) 1814 goto out_sock; 1815 1816 rc = x25_register_sysctl(); 1817 if (rc) 1818 goto out_dev; 1819 1820 rc = x25_proc_init(); 1821 if (rc) 1822 goto out_sysctl; 1823 1824 pr_info("Linux Version 0.2\n"); 1825 1826 out: 1827 return rc; 1828 out_sysctl: 1829 x25_unregister_sysctl(); 1830 out_dev: 1831 unregister_netdevice_notifier(&x25_dev_notifier); 1832 out_sock: 1833 dev_remove_pack(&x25_packet_type); 1834 sock_unregister(AF_X25); 1835 out_proto: 1836 proto_unregister(&x25_proto); 1837 goto out; 1838 } 1839 module_init(x25_init); 1840 1841 static void __exit x25_exit(void) 1842 { 1843 x25_proc_exit(); 1844 x25_link_free(); 1845 x25_route_free(); 1846 1847 x25_unregister_sysctl(); 1848 1849 unregister_netdevice_notifier(&x25_dev_notifier); 1850 1851 dev_remove_pack(&x25_packet_type); 1852 1853 sock_unregister(AF_X25); 1854 proto_unregister(&x25_proto); 1855 } 1856 module_exit(x25_exit); 1857 1858 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1859 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1860 MODULE_LICENSE("GPL"); 1861 MODULE_ALIAS_NETPROTO(PF_X25); 1862